You are logged on to the database as the database system administrator or as a DBM operator with server authorization for accessing database parameters (read and write) (see Glossary, Server Permission).
The database is in operational state ADMIN.
Specifies whether the database system writes redo log entries.
Do not switch redo log management off in normal database operation.
When redo management is switched off, the system does not write regular savepoints. This means that if you restart your database after a database crash, you lose all data since the last savepoint. If you have to restore your database, you can only restore it to the state of the last data backup.
Only consider switching redo log management off in special situations, for example in a test system or during a large load job.
If redo log management was off and you switch it back on, you then must carry out a complete data backup.
Concepts of the Database System, How Databases Log Data Changes